fix(Core/Objects): Include combat reach instead of object size in LoS… (#12013)

... calculations.

Fixed LoS calculations for dynamic objects.
Modified combat reach of Deep Pool Threshfin.
Fixes #11886

data/sql/updates/pending_db_world/rev_1654964701013345100.sql

@@ -0,0 +1,2 @@
+--
+UPDATE `creature_model_info` SET `CombatReach`=1.5 WHERE `DisplayID`=2836;